Bilateral Isokinetic Knee Strength Profiles in Trained Junior Soccer Players and Untrained Individuals

2005 ◽  
pp. 471-472
Keyword(s):  
Soccer Players ◽  
Knee Strength

The association between conventional and dynamic control knee strength ratios in elite soccer players

2015 ◽  
Vol 23 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Cassio V. Ruas ◽  
Matheus D. Pinto ◽  
Lee E. Brown ◽  
Felipe Minozzo ◽  
Pedro Mil-Homens ◽  
...  
Keyword(s):  
Dynamic Control ◽  
Soccer Players ◽  
Knee Strength ◽  
Control Knee

scholarly journals Isokinetic Strength Responses to Season-long Training and Competition in Turkish Elite Soccer Players

2012 ◽  
Vol 31 (1) ◽  
pp. 159-168 ◽  
Author(s):  
Niyazi Eniseler ◽  
Çağatay Şahan ◽  
Hikmet Vurgun ◽  
Hasan Mavi
Keyword(s):  
Knee Extensor ◽  
Peak Torque ◽  
Soccer Players ◽  
Isokinetic Strength ◽  
Professional Soccer ◽  
Knee Strength ◽  
Flexor Muscles ◽  
Angular Velocities ◽  
Soccer Training ◽  
Knee Flexors

Isokinetic Strength Responses to Season-long Training and Competition in Turkish Elite Soccer PlayersThere are not enough studies that describe the isokinetic strength of professional soccer players at high angular velocities. The purpose of this study was to evaluate the seasonal changes in isokinetic strength of Turkish professional soccer players (n=14) over the course of a 24-week soccer season. The isokinetic strength of players who underwent usual soccer training and weekly competition throughout the soccer season was assessed by means of the Biodex System 3 dynamometer with the knee attachment. The peak torque of knee extensor and flexor muscles were measured at angular velocities of 60°/s, 300°/s and 500°/s. Players were tested at the beginning and end of the competitive season. While the first- and second-test measurements did not show significant changes at 60°/s and 300°/s angular velocities, at the end of the training period, players' knee strength changed significantly at 500°/s angular velocities. In addition, the H/Q ratio improved significantly for the dominant as well as non-dominant leg at 500°/s. Significant bilateral strength improvements for knee flexors were also observed at 500°/s. The findings of this study suggest that usual daily soccer training (technical, tactical, power, strength, endurance, flexibility, etc.) and weekly competition might produce changes in knee strength at high angular velocities.

scholarly journals The Effects of Injury Preventive Warm-Up Programs on Knee Strength Ratio in Young Male Professional Soccer Players

PLoS ONE ◽  
2012 ◽  
Vol 7 (12) ◽  
pp. e50979 ◽  
Author(s):  
Abdolhamid Daneshjoo ◽  
Abdul Halim Mokhtar ◽  
Nader Rahnama ◽  
Ashril Yusof
Keyword(s):  
Young Male ◽  
Soccer Players ◽  
Strength Ratio ◽  
Warm Up ◽  
Professional Soccer ◽  
Knee Strength

scholarly journals Knee Flexor Eccentric Strength, Hamstring Muscle Volume and Sprinting in Elite Professional Soccer Players with a Prior Strained Hamstring

Biology ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 69
Author(s):  
Alberto Mendez-Villanueva ◽  
Francisco Javier Nuñez ◽  
Jose Luis Lazaro-Ramirez ◽  
Pablo Rodriguez-Sanchez ◽  
Marc Guitart ◽  
...  
Keyword(s):  
Biceps Femoris ◽  
Muscle Volume ◽  
Soccer Players ◽  
Hamstring Muscle ◽  
Knee Flexor ◽  
Hamstring Strain ◽  
Professional Soccer ◽  
Knee Strength ◽  
History Of ◽  
Flexor Strength

The aim was to determine if players with a prior hamstring strain injury (HSI) exhibit bilateral deficits in knee flexor eccentric strength and hamstring muscle volume and differences in sprinting performance compared with players without a history of HSIs. Forty-six male professional soccer players participated in this study. Eccentric knee flexor strength, hamstring muscle volume (MRI), and a 20-m running sprint test (5- and 10-m split time) were assessed at the start of the preseason. Eccentric knee strength of the previously injured limbs of injured players was greater (ES: 1.18–1.36) than the uninjured limbs in uninjured players. Previously injured limbs showed possibly larger biceps femoris short heads (BFSh) and likely semitendinosus (ST) muscle volumes than the contralateral uninjured limbs among the injured players (ES: 0.36) and the limbs of the uninjured players (ES: 0.56), respectively. Players who had experienced a previous HSI were possibly slower in the 5-m (small ES: 0.46), while unclear differences were found in both the 10-m and 20-m times. Players with a prior HSI displayed greater eccentric knee flexor strength, possibly relatively hypertrophied ST and BFSh muscles, and possibly reduced 5-m sprinting performances than previously uninjured players. This can have implication for the design of secondary hamstring muscle injury prevention strategies.

scholarly journals Analysis of isokinetic knee strength in soccer players in terms of selected parameters

2018 ◽  
Vol 23 (4) ◽  
pp. 209-216 ◽  
Author(s):  
A.K. Yılmaz ◽  
M. Kabadayı ◽  
Ö. Bostancı ◽  
M. Özdal ◽  
M.H. Mayda
Keyword(s):  
Body Composition ◽  
Statistical Difference ◽  
Soccer Player ◽  
Personal Information ◽  
Knee Extension ◽  
Soccer Players ◽  
Control Groups ◽  
Knee Strength ◽  
Body Mass Indexes ◽  
And Control

Purpose: The aim of study is to analyse isokinetic knee strength in soccer players in terms of selected parameters. Methods: A total of 30 subjects, 15 soccer players and 15 controls, were included in the study. Isokinetic knee strength measurements at angular speeds of 60°sec-1, 180°sec-1 and 240°sec-1 and pro-agility tests were conducted on the subjects. A body analyser was used for height, weight and body mass indexes (BMI) values. The training ages of the subjects and the positions of the soccer player group were recorded on personal information forms. Results: When the agility parameters were compared between football and control groups, a statistical difference was found in favour of the soccer player group (p < 0.05). When the effects of body composition and isokinetic knee strength on agility were analysed, negative significant correlation was found between weight and agility, BMI and agility and 240° right knee extension strength and agility (p < 0.05). When the positions of soccer players and isokinetic knee strengths were compared, significance was found between 60° right extension strength of defenders and midfielders and 60° left extension-flexion strengths of defenders and midfielders and forwards in favour of defenders (p > 0.05). Conclusions: In conclusion, it was found that isokinetic knee strength did not have an influence on agility in low angular speeds, except for 240°sec-1 right extension. According to positions, as the isokinetic knee strength of defenders decreased, they showed higher results when compared with other positions.

THE EFFECTS OF INJURY PREVENTION WARM-UP PROGRAMMES ON KNEE STRENGTH IN MALE SOCCER PLAYERS

2013 ◽  
Vol 30 (4) ◽  
pp. 281-288 ◽  
Author(s):  
Abdolhamid Daneshjoo ◽  
Abdul Halim Mokhtar ◽  
Nader Rahnama ◽  
Ashril Yusof
Keyword(s):  
Injury Prevention ◽  
Soccer Players ◽  
Warm Up ◽  
Knee Strength

Normalized Hip and Knee Strength in Two Age Groups of Adolescent Female Soccer Players

2019 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Joseph P. Hannon ◽  
Sharon Wang-Price ◽  
J. Craig Garrison ◽  
Shiho Goto ◽  
James M. Bothwell ◽  
...  
Keyword(s):  
Age Groups ◽  
Soccer Players ◽  
Adolescent Female ◽  
Knee Strength ◽  
Two Age Groups

scholarly journals Strength and Jump Biomechanics of Elite and Recreational Female Youth Soccer Players

2012 ◽  
Vol 47 (6) ◽  
pp. 609-615 ◽  
Author(s):  
Sara P. Chrisman ◽  
John W. O'Kane ◽  
Nayak L. Polissar ◽  
Allan F. Tencer ◽  
Christopher D. Mack ◽  
...  
Keyword(s):  
Risk Factors ◽  
Vertical Jump ◽  
Soccer Players ◽  
Jump Height ◽  
Female Youth ◽  
Youth Soccer ◽  
Youth Athletes ◽  
Knee Strength ◽  
Vertical Jump Height ◽  
Flexion Extension

Context Most researchers investigating soccer injuries have studied elite athletes because they have greater athletic-exposure hours than other athletes, but most youth participate at the recreational level. If risk factors for injury vary by soccer level, then recommendations generated using research with elite youth soccer players might not generalize to recreational players. Objective To examine injury risk factors of strength and jump biomechanics by soccer level in female youth athletes and to determine whether research recommendations based on elite youth athletes could be generalized to recreational players. Design Cross-sectional study. Setting Seattle Youth Soccer Association. Patients or Other Participants Female soccer players (N = 92) aged 11 to 14 years were recruited from 4 randomly selected elite (n = 50; age = 12.5 years, 95% confidence interval [95% CI]) = 12.3, 12.8 years; height = 157.8 cm, 95% CI = 155.2, 160.3 cm; mass = 49.9 kg, 95% CI = 47.3, 52.6 kg) and 4 randomly selected recreational (n = 42; age = 13.2 years, 95% CI = 13.0, 13.5 years; height = 161.1 cm, 95% CI = 159.2, 163.1 cm; mass = 50.6 kg, 95% CI = 48.3, 53.0 kg) soccer teams. Main Outcome Measure(s) Players completed a questionnaire about demographics, history of previous injury, and soccer experience. Physical therapists used dynamometry to measure hip strength (abduction, adduction, extension, flexion) and knee strength (flexion, extension) and Sportsmetrics to measure vertical jump height and jump biomechanics. We compared all measurements by soccer level using linear regression to adjust for age and mass. Results Elite players were similar to recreational players in all measures of hip and knee strength, vertical jump height, and normalized knee separation (a valgus estimate generated using Sportsmetrics). Conclusions Female elite youth players and recreational players had similar lower extremity strength and jump biomechanics. This suggests that recommendations generated from research with elite youth soccer players could be generalized to recreational players.

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